The warning even included telling credit unions to “consider alerting members about the Internet threat for May 7 and asking members to execute critical online banking business on a different day or come into the credit union office.”

They also were advised to alert call centers and their network staff.

Tom Nohelty, CUNA’s vice president of information technology, said in the announcement, “It is not possible to assess the veracity of the threat at this time, but it is important that credit unions be aware and prepared at all times.

“Also, some of the largest credit unions are included in a list of targets for the purported May attack so heightened awareness is warranted.”